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Finding the Fourth Proportional to 258.13, 356.21 and 153.34

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Solution

The fourth proportional to 258.13, 356.21 and 153.34 is: 211.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.13 : 356.21 = 153.34 : x
  2. Step 2: Convert to fraction form
    258.13/356.21 = 153.34/x
  3. Step 3: Cross multiply
    258.13x = 356.21 × 153.34
  4. Step 4: Simplify right side
    258.13x = 54,619.58
  5. Step 5: Solve for x
    x = 54,619.58/258.13
  6. Step 6: Final answer
    x = 211.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.